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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b9007e4f56b9c575f2b53c1d039adc02fa51c5dead5cf9634d2b823b82e5d2' 
  AND token = 'nfv0Ow73xnUTHLEjMQXyoGeiAwKAWjf0h4HK4qGR4Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}